Abstract
We describe the results of an experiment to test for spacetime anisotropy terms that might exist from Lorentz violations. The apparatus consists of a pair of cylindrical superconducting cavity-stabilized oscillators operating in the mode with one axis east-west and the other vertical. Spatial anisotropy is detected by monitoring the beat frequency at the sidereal rate and its first harmonic. We see no anisotropy to a part in . This puts a comparable bound on four linear combinations of parameters in the general standard model extension, and a weaker bound of on three others.
- Received 19 November 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.060403
©2003 American Physical Society